Altruism in Forest Chimpanzees: The Case of Adoption Boesch, Christophe ; Bolé, Camille ; Eckhardt, Nadin ; Boesch, Hedwige Abstract Publication: PLoS ONE Pub Date: January 2010 DOI: 10.1371/journal.pone.0008901 Bibcode: 2010PLoSO...5.8901B